Rock-drill



the steam-chest, an exhaust-port on each end Intestimony that I claimthe foregoing I have hereunto set my hand this 7th day of November,1895.

ADAM SCHEID.

'itnesses ALFRED GARTNER, DUNCAN M. ROBERTSON.

(No Model.)

A. SGHEID.

ROCK DRILL.

No. 555,128. Patented Feb. 25,1896.

WITNESSES: INVENTOR mzear (J m I r BY W 5,

ATTORN EYS NiTEn STATES PATENT OFFICE.

ADAM SCHEID, OF HARRISON, NEYV JERSEY.

ROCK-DRILL.

SPECIFICATION forming part of Letters Patent No. 555,128, dated February25, 1896.

Application filed November 13, 1895. Serial No. 568,800 No modeld To allwhom it may concern.-

Be it known that I, ADAM SCHEID, a citizen of the lfnited States,residing in Harrison, lludson county, and State of New Jersey, haveinvented certain new and useful Improvements in Rock-Drills; and I dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same, reference being had to theaccompanying drawing, and to letters of reference marked thereon, whichforms a part of this specification.

The object of my present invention is to provide a rock-drill of simple,strong and durable construction, reliable and efiicient in operation,and in which drill the piston and the trip-valve are operated by livesteam only.

The invention consists in the novel arrangement and connection betweenthe steamchest, the trip-va1ve and the cylinder of said rock-drill, andalso in the arrangement and combination of parts, hereinafter more fullydescribed and claimed.

In the accompanying drawing, which represents a central longitudinalsection of the improved rock-drill, a is the cylinder and p thedrill-rotating piston, which latter is provided at its center with anannular groove 1), and with two ports 17 and p penetrating the sidewalls of the piston and extending in opposite directions, and having alength equal to about three-quarters of the length of the said piston.

The cylinder (0 is provided at or near each end with an annular grooveor chamber 0 (and b) and in its center with an annular groove cl. Oneach side of said annular groove (Z and a specified distance therefromare arranged the exhaust holes or ports 6 and f, penetrating the wall ofthe cylinder or connected with an exhaust through channels in anydesired manner, as will be manifest. On one side of the cylinder isarranged the steamchest 9 containing the trip-valve 72 This steam-chestcommunicates through port on with the annular chamber 0 at the lower endof the cylinder and through port m with the annular chamber 1') at theupper end thereof.

Leading from the ends of the steam-chest into the cylinder to are twoports m and m adapted to convey the exhaust from the steamchest into theannular groove 1) of the piston, which, during the operation,communicates respectively with the exhaust-holes e and f 5 in cylinder(4.

The steam-inlet 0 is arranged in the cylinder and communicates throughports with the annular groove (1 of cylinder a and with the chamber 13of steam-chest g.

The trip-valve consists of the piston-rod having two series of doubleheads h 7L2 and 71 71 forming a series of annular chambers '1 i and 2respectively, and are adapted to alternately open and close the variousports, as hereinafter described.

Ports m and m connect the ports m and m with the stean1-chest and theannular chambers i and 2' respectively, which latter chambers i and 2'are also connected by ports 75 and k with the opposite ends of thesteam-chest. Said ports I; and k are arranged in the pistonrod of thetrip-valve, as clearly shown. I

Suppose the trip-valve and drill-piston to be in the position shown inthe drawings. Steam enters through inlet 0 into the annular ringd andfrom there through port 29 into the annular chamber 1), thus startingthe downward movement of the piston. Simultaneously the steam from saidchamber 1) passes through channel m and port m into the annular chamberi and from there through port k to the lower end of the steam-chest andforces the trip-valve upward. The ports on and m are thus closed, whilethe ports m and m are opened. During this operation the piston has moveddownward a sufficient distance to close the communication between theannular grooves d and I) through port 19 and between the upper end ofthe steam-chest and the annular groove 19 through port m which lattercommunicated with the exhausthole f. The steam now enters throughchambers i and port m" into the upper end of the cylinder and completesthe downward movement of the piston. hen the latter has reached itslowermost position, the exhausthole f is opened and allows the exhaustfrom the upper end of the cylinder to escape, and as the lower end ofthe steam-chest at that 1

